Robert V. F. Janssens

 

(630) 252-8426
FAX: (630) 252-6210
janssens@anl.gov


Robert Janssens

Education

B.Sc. Physics Catholic University of Louvain, Belgium 1969-1973
Ph.D. Nuclear Physics Catholic University of Louvain
"Contribution to the Nuclear Spectroscopy of Erbium Isotopes"
1973-1978

Career

Research Associate Kernphysisch Versneller Instituut (KVI),
University of Groningen, The Netherlands
1978-1980
Physics Professor E.R.C. (Military Academy), Brussels, Belgium 1980-1981
Assistant Scientist Physics Division, Argonne National Laboratory 1981-1984
Scientist Physics Division, Argonne National Laboratory 1984-1993
Senior Scientist Physics Division, Argonne National Laboratory 1993-present
Chief Low Energy Nuclear Physics group 1994-2000
Scientific Director ATLAS facility, & Associate Division Director 2000-2011
Adjunct Professor Michigan State University 2001-present
Adjunct Professor University of Notre Dame

2004-present

Director Physics Division 2008-2017

Research Interests

My main research interests lie in the study of nuclear structure at the limits of stability, in high-Z nuclei and in neutron-rich nuclei. Most recently, we have initiated a program to investigate shell structure in neutron-rich nuclei just above 48Ca by combining a number of techniques and facilities. Our approach is one where we combine beta decay and intermediate-energy Coulomb excitation measurements performed at the NSCL with deep inelastic reactions or fusion-evaporation with radioactive targets carried out with Gammasphere at ATLAS. Another program at ATLAS uses Gammasphere to carry out so-called "unsafe" Coulomb excitation experiments on long-lived actinide nuclei in order to determine the important degrees of freedom responsible for the various excitations as a function of spin. I am also fascinated by the impact of structure on nuclear astrophysics processes and am participating in measurements in this area.

Over the years, I have supervised a number of graduate students who were based at ANL for their thesis research: D. Ye (U. Notre Dame, 1991), A.J.M. Plompen (Free U. Amsterdam, 1992), I.G. Bearden (Purdue U., 1993), D. Nisius (Purdue U., 1996), H. Amro (North Carolina State U., 1999), L.T. Brown (Vanderbilt U., 1999), K. Abu Saleem (Illinois Institute of Technology, 2002), X. Wang (U. Notre Dame, on-going).

 

Recent Publications

 “STRENGTH OF OCTUPOLE CORRELATIONS IN THE ACTINIDES: CONTRASTING BEHAVIOR IN THE ISOTONES 237U AND 239Pu”,
S. Zhu, R. V. F. Janssens, et al., Phys. Lett. B 618, 51 (2005)

“ELUSIVE MAGIC NUMBERS”,
Robert V. F. Janssens, Nature 435, 897 (2005)

“YRAST STRUCTURE OF NEUTRON--RICH 53Ti NUCLEUS”,
B. Fornal, S. Zhu, R. V. F. Janssens, et al., Phys. Rev. C 72, 044315 (2005)

“PHYSICS OF A RARE ISOTOPE ACCELERATOR”,
D. F. Geesaman, C. K. Gelbke, R. V. F. Janssens, and B. M. Sherrill, Annu. Rev. Nucl. Part. Sci. 56, 53 (2006)

“SPECTROSCOPY OF THE ODD-ODD fp-SHELL NUCLEUS 52Sc FROM SECONDARY FRAGMENTATION”,
A. Gade, R. V. F. Janssens,et al., Phys. Rev. C 73, 037309 (2006)

“CROSS-SHELL EXCITATION IN TWO-PROTON KNOCKOUT: STRUCTURE OF 52Ca”,
A. Gade, R. V. F. Janssens, et al., Phys. Rev. C 74, 0211302(R) (2006)

 “ONE-NEUTRON KNOCKOUT IN THE VICINITY OF THE N = 32 SUB-SHELL CLOSURE: 9Be(57Cr,56Cr +g)X”,
A. Gade, R. V. F. Janssens, et al., Phys. Rev. C 74, 047302 (2006)

“LEVEL STRUCTURE OF THE NEUTRON-RICH 56,58,60Cr ISOTOPES: SINGLE-PARTICLE AND COLLECTIVE ASPECTS”,
S. Zhu, A. N. Deacon, S. J. Freeman, R. V. F. Janssens, et al., Phys. Rev. C 74, 064315 (2006)

“YRAST STRUCTURE OF 64Fe”
N. Hoteling, W. B. Walters, R. V. F. Janssens, et al., Phys. Rev. C 74, 064313 (2006)

“ONE-PARTICLE EXCITATIONS OUTSIDE THE 54Ti SEMI-MAGIC CORE: THE 55V AND 55Ti YRAST STRUCTURES”
S. Zhu, R. V. F. Janssens, et al., Phys. Lett. B 650, 135 (2007)

“ YRAST STRUCTURE OF THE NEUTRON-RICH N = 31 ISOTONES 51Ca AND 52Sc”
B. Fornal, R. V. F. Janssens, et al., Phys. Rev. C 77, 014304 (2008)

”ROTATION-ALIGNED COUPLING IN 61Fe”
N. Hoteling, W. B. Walters, R. V. F. Janssens, et al., Phys. Rev. C 77, 044314 (2008)